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Add PseudoSourceValue::mayAlias. It returns true if the object can ever alias any LLVM IR value.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85762 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-11-01 23:50:04 +00:00
parent f4e748bc3f
commit f57b1baa44
2 changed files with 21 additions and 0 deletions
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17
lib/CodeGen/PseudoSourceValue.cpp
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@ -64,6 +64,8 @@ namespace {
virtual bool isAliased(const MachineFrameInfo *MFI) const;
virtual bool mayAlias(const MachineFrameInfo *) const;
virtual void printCustom(raw_ostream &OS) const {
OS << "FixedStack" << FI;
}
@ -100,6 +102,14 @@ bool PseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
return true;
}
bool PseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
if (this == getGOT() ||
this == getConstantPool() ||
this == getJumpTable())
return false;
return true;
}
bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
return MFI && MFI->isImmutableObjectIndex(FI);
}
@ -113,3 +123,10 @@ bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
// Spill slots should not alias others.
return !MFI->isFixedObjectIndex(FI) && !MFI->isSpillSlotObjectIndex(FI);
}
bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
if (!MFI)
return true;
// Spill slots will not alias any LLVM IR value.
return !MFI->isSpillSlotObjectIndex(FI);
}